1, look at the color. Photocatalysts exhibit different […]
1, look at the color. Photocatalysts exhibit different colors due to different preparation methods and uses. Common colors are milky white, light yellow, light blue or colorless liquid, translucent liquid. If the color is dark, it is a fake photocatalyst product.
2, light dispersion. When the visible light passes through the sol, it will produce a significant scattering effect, namely the Tyndall phenomenon. The colloid has a Tydal phenomenon, and the solution does not, so the Tyndall phenomenon can be used to distinguish the colloid and the solution. The photocatalyst solution of any color should have a Tyndall phenomenon. If there is no Tyndall phenomenon, it is a fake photocatalyst product.
3, stability. Photocatalyst dispersion technology is better, generally does not stratify, precipitate, but if the nanometer particle size is small, there is no dispersant, then there may be a little agglomeration after standing for a long time, and it can be shaken a few times when used, without affecting the performance. If it is easy to precipitate and precipitate more, it is a fake photocatalyst product. Counterfeit products are caused by a large amount of precipitation due to poor material selection and poor dispersion process. This precipitation is not caused by the high content of nano titanium dioxide, but entirely due to materials and technical reasons. One reason is that ordinary titanium dioxide is used to counterfeit nano-sized titanium dioxide, and the particles are thousands of times larger; another reason is that the production process is not enough, and the nano-titanium dioxide is in agglomerated state, which is far greater than the national nanotechnology standard of 100 nanometers.